I play with a template both for multi- and onepage and CMSimple_XH-1.7.2. With the multi version everything works fine. With onepage I reached the point of problem. Using the navigation, the content shall scroll just below the "pseudo header". It goes to the top and is covered by the "pseudo header". What is the trick? The image shows the Standard state, scrolling after menu clicking and desired state.

onepage.jpg

sliding-nav.zip

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CMSimple.skIt's no shame to ask for an answer if all efforts failed.
But it's awful to ask without any effort to find the answer yourself.